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What does the window next to the handle of the TeSys U indicate?

Issue:
What do the 1 and 0 indicate in the window of the LUB power base? 

Product Line:
TeSys U Starters - GIC Product

Environment:
US Product

Cause:
Product characteristics

Resolution:
This window indicates the state of the device, running, or tripped, and what kind of trip. 
1 indicates that the device is running, 0 is not running. 
I>> indicates a magnetic fault. 
See the attached instruction bulletin (step H) for illustration. 
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